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77 stabilising EO/IR systems. EMCORE’s FOGs exhibit performance in terms of bias and noise five to 10 times better than those of its competitors, he said. When stabilising images, the bandwidth of the gyro is the limiting factor on the frequency of the movement it can detect and correct by sending commands to the servo motors. “We typically see 1800 Hz bandwidth on our EN-300 for instance, which is an order of magnitude higher than RLG systems,” Faulkner said. Quartz MEMS technology from Systron Donner Inertial offers advantages over established silicon MEMS devices, including lower noise and stability over a wider temperature range, and at a much lower cost than laser-based systems. “Silicon MEMS are mostly commercial grade, some industrial, but none get to the true tactical grade, meaning 1 º /h over a specified temperature range,” he said. “Ours do though, because they are made from quartz.” Controp’s STAMP-VMD and T-STAMP-XD payloads for small UAVs were the most UAV-focused of several products the company introduced at the show. VMD stands for Video Motion Detection, and STAMP-VMD is intended to bring the kind of persistent surveillance that was previously the preserve of large payloads on MALE UAVs to much smaller Group 1 and Group 2 vehicles operated at brigade or platoon level, according to Raanan Shelach, while cuing the T-STAMP-XD for targeting purposes. Designed for quiet electric or hybrid drones flying below cloud at 1500-3000 ft, the 1.3 kg STAMP-VMD covers an area of 1 sq km at high resolution and applies advanced software to detect, classify and geolocate relevant moving targets, alert troops on the ground and transmit this information with an enlarged image directly to their battle management system. All the processing inside the STAMP- VMD is done in real time on a small, lightweight card. When the target has been classified, it can be passed to the 5.7 kg T-STAMP-XD for laser designation. The two payloads could be on separate aircraft – Controp showed the STAMP- VMD on an Aeronautics Orbiter 2, and the T-STAMP-XD on an Orbiter 3. Putting a system tasked with detecting moving targets onto a small UAV brought a number of challenges for the software engineers, Shelach said, particularly avoiding false alarms triggered by the aircraft’s own movement. “When orbiting an area, houses and trees could generate false targets because they appear to move,” he said. Advanced Navigation showed Certus, its new generation of inertial navigation systems based on solid- state MEMS gyros and accelerometers, which are designed to offer better performance with easier integration. It is the first product family to incorporate the company’s new GNSS receiver that processes signals from GPS, GLONASS, BeiDou and Galileo on multiple frequencies; it also supports RTK/PPK positioning and provides 256 Gbytes of data logging. Chris Shaw explained, “With many interfaces available and the ability to support multiple protocols, the Certus range integrates easily in a wide range of applications.” The two models are the Certus DSEI 2019 | Show report Unmanned Systems Technology | December/January 2020 The Certus Evo INS from Advanced Navigation Persistent surveillance courtesy of Controp